Chevy Silverado Blower Module Location- Part Number

Question: I'm looking for a HVAC module for a Chevy Silverado 2002. I'm pretty sure that's my problem right now. When engine is off the fans are still working, i had to pull out the FRT-HVAC(30A) fuse to make it stop, its screwing up all the other electronics in the truck as well. I'm not a mechanic but I'm sure it has something to do with it, what do you think?
 Answer: It could very well be the problem, yes. But I would want to check the wiring and possibly the blower itself, and/or the blower resistor. They have been known to burn up.

Thanks, it was the resistor after all, i just took it apart. Do you have a site where i could find a cheap one?
 That's great! Glad you found the problem! It's an easy fix, so you should be up and running in no time! Make sure to check the connector as well...sometimes those burn up at the terminals too. I would only recommend using factory replacement parts for that repair. They aren't that expensive anyway, you can check your local GM dealer.

Alright will do. Sounds good, thanks again for your help!  Your very welcome.

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Question:
the new recirculate door actuator has pin 9 & 10 missing, these are the feedback circuits. Question is, do I have a wrong or defective actuator. Part # on old actuator is 74568376 or 52402588 not sure which. Part # on new actuator is 52411437. Part # on box actuator is in is 89018678? 2004 Chevy Silverado 1500 5.3L Vortec. Codes = recirculation door feedback circuit. Started to replace door actuator when I found a problem. (I think).

Answer:
You'd really have to have the parts department re-check those numbers and make sure they got you the correct actuator. There are multiple actuators and multiple doors for your HVAC system. Hopefully you're using GM parts!

There have been changes made to these parts over the years, so missing or relocated pins could be normal. I've changes many of these on the GM truck line, Silverado, Tahoe, Suburban, Sierra, etc. More often than not, when I had a code for a specific actuator it was always the actuator that was bad. Some are easier to change than others, just make sure it is aligned properly during installation.

You will need to do a recalibration of all the actuators if you replace one, which can be done with a Tech2 Scanner.

If you don't have or can't access one of those, remove the fuse for the HVAC control head for a minute, then replace and turn the key on. Don't touch any buttons for about 20 seconds and they will recalibrate on their own.

Question
I have a 1999 Silverado. Whenever the AC or Heater is turned on the fan buzzes loudly, and the buzzing gets louder as the air is turned up. It still produces air/heat but it's very loud and may lead to a failure eventually. Is this a problem with the blower motor? Does it need to be replaced? 1999 Chevy Silverado 5.3L V8. Air filter has been replaced since buzzing started. No result.

Answer:
Most likely what you are experiencing with your Silverado is either debris inside the heater case that is contacting the blower motor as it spins, or just a faulty blower motor. Sometimes a piece of paper or trash gets sucked into the area where the blower motor is mounted and it hits the plastic fan blade and makes a buzzing sound.

It's even possible that something from the glove box made it's way into the wrong place. I've pulled anything from wrappers, straws, envelopes, and napkins from inside the blower motor housing before, so anything is possible. I would recommend removing the blower motor to check for debris. If none is found, inspect the fan for any broken pieces or being out of round. Replace as necessary.


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